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Inventories Schedule of Inventory (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Sep. 01, 2017
Inventory [Line Items] |  |  |  |
Finished Products | $ 4,390 |  | $ 4,204 |
Semi-finished Products | 1,338 |  | 1,769 |
Raw Materials | 523 |  | 481 |
Stores and Supplies | 385 |  | 441 |
Total | 6,636 |  | 6,895 |
Adjustment of inventories to a LIFO basis | 511 |  | 512 |
Total inventories | 7,147 |  | $ 7,407 |
Merger with Dow [Member] |  |  |  |
Inventory [Line Items] |  |  |  |
Business Combination, Fair Value Step Up Of Acquired Inventory |  |  |  | $ 3,840
Business Combination, Fair Value Step-Up Of Acquired Inventory, Amount recognized in Cost of Goods sold | $ 205 | $ 641 |  |

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